Whisk together the mirin, rice vinegar, soy sauce, and sesame oil in a shallow dish. Add the tofu and marinate for 30 minutes.
Preheat the oven to 425F and transfer the tofu to a baking sheet lined with a silpat or parchment paper. Reserve the marinade.
Bake the tofu for 15 minutes until lightly crispy at the edges.
Meanwhile, simmer the marinade in a small pot until reduced by about a third.
Serve as desired. YES.
Notes
I love this for meal prep, and make two or three blocks of tofu at a time to use throughout the week. This is great on rice bowls, over veggie curry, or in salads! The reduced marinade is wonderful as a salad dressing or drizzled over the baked tofu and rice.